My other house, In a tropical barrio, is the only house I have built. Actually I paid poor workmen scandalously low daily wages to hand carry cement sacks and rebar & 'hollow block' down steep paths (no cars near my place).
With no plans they built me a two-story shack with pleasant views over banana trees. I found a 600W Bosh drill and an Anglegrinder on the Mabini power tools balck-market only
after the house was finished. The remaining extruding rebar can now be easily removed. Prior to the Bosch it was hand hacksaw blades.
The only work I did personally was ten minutes digging in the pit. Many sacks of cement walked into the barrio, bonus for the skilled builders.
Anyway, the 'shower' - actually tabot (ladle) tipped on the head (my God how everything in the 3rd world needs explaining) , the shower, has tiles, which I felt needed to be cleaner. So I got a jug of cheap chlorine bleach and scrubbing brushes.
However late at night I disturbed a toad in the shower attempting to hide himself in a gap rather too small for his girth. I was immensely cheered to see a potential eater of Ipis. (Ipis are large cockroaches, very similar to the 'skateboards' seen in Sydney) But I fear that bleach may be too harsh for my toad. Hypochlorite is such a killer that its downstream power causes ecofreaks to despise it.
Anyway the Ipis are abounding. I hear reports they are flying about in the kitchen (I am in another country right now).
So our tropical mice dont eat them all,either. Thats the problem with predators, they usually reach equilibrium, not obliteration. Cats in the tropics are ultra thin, wiry and wiley. You dont generally 'get' a cat there, you just encourage them with chicken heads (the people there are known to deep-fry chicken heads, hence the cats are thin).
I hope the toad is well. Reptiles (Geckos) and Amphibians are preferable predators, since mammals shit so much more.
About equilibrium: I had a cat once, in Auckland, a small and delicate creature named Nepet. One day I noticed my paper nautilus shell had vanished from my mantlepiece. Looking about I discovered hundreds of tiny pieces, none larger than a few mm. I surmised than Nepet had taken a swipe the delicate shell, broken it, and then tried to hide her crime by smashing it such small pieces, and hoping I would forget it. Instead, I punished her by blocking the cat door for the night, with her outside. In the morning, on the doorstep, was a large rat, in memory, almost Nepet's size. She made her point well.